code: def value_function(self):
      return tf.reshape(self._value_out, [-1])
  
file_path: ray/python/ray/rllib/examples/models/rnn_spy_model.py
imports: import numpy
  import pickle
  import ray
  from ray.rllib.models.modelv2 import ModelV2
  from ray.rllib.models.tf.misc import normc_initializer
  from ray.rllib.models.tf.recurrent_net import RecurrentNetwork
  from ray.rllib.utils.annotations import override
  from ray.rllib.utils.framework import try_import_tf
label_desc: Use image node_id 3 for calling the RNNSpyModel obj's underlying member method code with example usage: obj.value_function() and returns: tf